单选题：建筑屋顶避雷网格的间距应按设计规定。如果设计无要求时，二类防雷建筑的屋顶避雷网格间距为（　　）。

题目内容：

建筑屋顶避雷网格的间距应按设计规定。如果设计无要求时，二类防雷建筑的屋顶避雷网格间距为（　　）。 A．5m×5m
B．10m×10m
C．15m×15m
D．20m×20m

参考答案：

答案解析：

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